Filters

Filter bank construction

mel(sr, n_fft[, n_mels, fmin, fmax, htk, ...])

Create a Filterbank matrix to combine FFT bins into Mel-frequency bins

chroma(sr, n_fft[, n_chroma, tuning, A440, ...])

Create a Filterbank matrix to convert STFT to chroma

constant_q(sr[, fmin, n_bins, ...])

Construct a constant-Q basis.

_multirate_fb([center_freqs, sample_rates, ...])

Helper function to construct a multirate filterbank.

semitone_filterbank([center_freqs, tuning, ...])

Constructs a multirate filterbank of infinite-impulse response (IIR) band-pass filters at user-defined center frequencies and sample rates.

Window functions

window_bandwidth(window[, n])

Get the equivalent noise bandwidth of a window function.

get_window(window, Nx[, fftbins])

Compute a window function.

Miscellaneous

constant_q_lengths(sr, fmin[, n_bins, ...])

Return length of each filter in a constant-Q basis.

cq_to_chroma(n_input[, bins_per_octave, ...])

Convert a Constant-Q basis to Chroma.

mr_frequencies(tuning)

Helper function for generating center frequency and sample rate pairs.

window_sumsquare(window, n_frames[, ...])

Compute the sum-square envelope of a window function at a given hop length.

diagonal_filter(window, n[, slope, angle, ...])

Build a two-dimensional diagonal filter.